A 42-year-old woman presented with a recurrent eruption over the distal extremities. Lesions formed a few days after initiation of intravenous immunoglobulin (IVIg) therapy and lasted 2 to 3 weeks after therapy completion. Results of a histologic examination revealed parakeratosis, exocytosis, and spongiosis. The clinical and histologic findings are similar to previous reports. The mechanism of this eruption is not known.